How to filter data from database using date and fill in combobox

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.NET4.5

I need to fill a specific value on the combobox from the database which is to be filtered by using date.
Please help me to do this.

What I have tried:

C#

OleDbConnection connection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\Rd\\Documents\\Soundar1.accdb");
        DataTable dt = new DataTable();
        DataSet ds = new DataSet();

 private void button1_Click(object sender, EventArgs e)
        {
            //try
            //{
                connection.Open();

                string sql = "select Sno from Table1 where dt=" + dateTimePicker1.Value.ToString("MM/dd/yyyy");
                OleDbDataAdapter da = new OleDbDataAdapter(sql, connection);
                da.Fill(dt);
                //da.Fill(ds,"Table1");
                comboBox1.DisplayMember = "Sno";
                comboBox1.DataSource = dt;

                connection.Close();
            //}
            //catch (Exception ex)
            //{
            //    MessageBox.Show(ex.ToString());
            //}
        }

I tried this but its not working.

Posted 6-May-16 21:52pm

S.Soundar

Updated 6-May-16 23:32pm

Santosh Kokatnur

v3

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Comments

Richard Deeming 7-May-16 6:27am

NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
Query Parameterization Cheat Sheet | OWASP[^]

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Karthik_Mahalingam · Accepted Answer · 2016-05-06T22:02:00

try this

C#

string value = dateTimePicker1.Value.ToString("MM/dd/yyyy");
           string sql = "select Sno from Table1 where dt= @dt";
           OleDbDataAdapter da = new OleDbDataAdapter(sql, connection);
           da.SelectCommand.Parameters.AddWithValue("@dt", value);
           da.Fill(dt);